package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {

        //校验手机号
        if(RegexUtils.isPhoneInvalid(phone))
        {
            return Result.fail("手机号码格式错误!");
        }

        //符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //把验证码保存到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //发送验证码
        log.debug("发送短信验证码成功，验证码:{}",code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {

        //1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone))
        {
            return Result.fail("手机号码格式错误!");
        }

        //2.从redis获取验证码并校验
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.equals(code))
        {
            //3.不一致，报错
            return Result.fail("验证码错误");
        }

        //4。一致，根据手机号查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();

        //5.判断用户是否存在
        if(user == null)
        {
            //6.用户不存在，则创建新用户
            user = createUserWithPhone(loginForm.getPhone());
        }

        //7.保存用户信息到redis中
        String token = UUID.randomUUID().toString(true);

        UserDTO userDTO = BeanUtil.copyProperties(user,UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString())
                );

        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);

        //返回token
        return Result.ok(token);
    }

    @Override
    public Result sign()
    {
        //1.获取当前用户
        Long userId = UserHolder.getUser().getId();

        //2.获取当前日期
        LocalDateTime now = LocalDateTime.now();

        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;

        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();

        //5.写入redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);

        return Result.ok();
    }

    @Override
    public Result signCount()
    {
        //1.获取当前用户
        Long userId = UserHolder.getUser().getId();

        //2.获取当前日期
        LocalDateTime now = LocalDateTime.now();

        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;

        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();

        //5.获取截止今天的签到记录
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0)
        );

        if(result == null || result.isEmpty())
        {
            return Result.ok(0);
        }

        Long num = result.get(0);
        if(num == null || num == 0)
        {
            return Result.ok(0);
        }

        int count = 0;
        while (true)
        {
            if((num & 1) == 0)
            {
                break;
            }
            else
            {
                count++;
            }
            num >>>= 1;
        }

        return Result.ok(count);
    }

    private User createUserWithPhone(String phone)
    {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
